I am playing at 4k resolution and was unable to eliminate screen tearing no matter the ingame settings. I found that by enabling Triple Buffering and Adaptive vSync within the Wither 3 drive profile, it has helped an awful lot though. I still get some in cutscenes though, but nowhere near as much.
I started on Blood and Broken Bones difficulty, and was fine until I had to defeat wraiths during the Barons mission with his baby. Dropped it to normal difficulty, and it was much easier. Would prefer to play on B&BB level but the constant deaths became frustrating, and most of the time I ventured round with next to no health as it doesnt heal on meditation. Any good advise for starting out in B&BB difficulty?
Stockpile food, use oils and upgrade quen as much as possible. That quest with the wraiths is tough though because your against the clock. I also had to reduce the difficulty.